title: Acute sleep deprivation delays the glucagon-like peptide 1 peak response to breakfast in healthy men.
abstract: OBJECTIVE
  Previous experiments have demonstrated that acute sleep loss impairs glucose homeostasis and increases food intake in humans. The incretin hormone glucagon-like peptide 1 (GLP-1) enhances postprandial insulin secretion and promotes satiety. Hypothesizing that the detrimental metabolic effects of sleep curtailment imply alterations in GLP-1 signaling, we investigated 24-h serum total GLP-1 concentrations during total sleep deprivation (TSD) and a normal sleep/wake cycle (comprising ∼8 h of sleep) in 12 healthy young men.
  
  
  METHODS
  Sessions started at 1800 h, and subjects were provided with standardized meals. Assessments of serum GLP-1 took place in 1.5- to 3-h intervals, focusing on the response to breakfast intake (3.8 MJ).
  
  
  RESULTS
  Across conditions, 24-h concentration profiles of GLP-1 were characterized by the expected postprandial increases (P<0.001). Although there were no differences in magnitude between conditions (P>0.11), the postprandial GLP-1 peak response to breakfast intake was delayed by ∼90 min following sleep loss in comparison with regular sleep (P<0.02).
  
  
  CONCLUSIONS
  RESULTS indicate that acute TSD exerts a mild, but discernible effect on the postprandial dynamics of circulating GLP-1 concentrations in healthy men.
authors.affiliation: Department of Neuroscience, Uppsala University, Uppsala, Sweden.
authors.forename: C
authors.initials: C
authors.lastname: Benedict
authors.forename: J L
authors.initials: JL
authors.lastname: Barclay
authors.forename: V
authors.initials: V
authors.lastname: Ott
authors.forename: H
authors.initials: H
authors.lastname: Oster
authors.forename: M
authors.initials: M
authors.lastname: Hallschmid